The present invention relates to an apparatus and a method in which a tubular lining material is folded back at one end and airtightly attached to an eversion nozzle and an eversion pressure is applied thereto to evert the lining material.
Conventionally, when an existing pipe such as a sewer pipe buried underground has deteriorated, the inner wall surface of the existing pipe is lined to rehabilitate the existing pipe using a lining material having a resin absorbent material that is made of a flexible tubular non-woven fabric and impregnated with a setting resin.
The lining material is everted and inserted into the existing pipe or pulled in for insertion. In a case where the lining material is everted for insertion into the existing pipe, an apparatus for everting the lining material, is used. Patent Document 1 below describes an arrangement in which the lining material is wound into a roll and housed in a sealed housing container with one end thereof folded back for attachment to an eversion nozzle and compressed air is supplied to the housing container to evert the lining material.
Patent Document 2 below describes an arrangement in which the lining material is folded back at one end for attachment to one end of an eversion tube and passed at the other end through a sealed opening attached to the other end of the eversion tube, and compressed air is supplied into the tube to evert the lining material.
Patent Document 3 below describes an arrangement in which a lining material is drawn a certain length into a chamber provided with an eversion nozzle as well as an inlet and an outlet for the lining material, and the inlet is thereafter closed with the outlet made open to introduce compressed air into the chamber and evert the lining material. In this arrangement, after the lining material is everted and inserted a certain length into the existing pipe, the outlet is closed with the inlet made open and the lining material is newly drawn a certain length into the chamber. Repeating the operation as described above allows the lining material to be continuously everted and inserted into the existing pipe.
Patent Document 1: JP 2006-205722 A
Patent Document 2: U.S. Pat. No. 6,390,795
Patent Document 3: JP 2012-516251 A
The arrangement of Patent Document 1 has a drawback that the length of the lining material that can be inverted is limited because only the lining material stored in the housing container can be inverted. If it is desired to evert a long lining material, there is a problem that it is necessary to increase the volume of the housing container according to the length thereof.
On the other hand, in the arrangement described in Patent Document 2, the length of the lining material is not limited and the lining material can be inverted. However, in the arrangement of Patent Document 2, compressed air that everts the lining material leaks from the sealed opening. This deteriorates the eversion efficiency. If the opening is more strongly sealed to prevent the leakage, it becomes difficult for the lining material to pass through the sealed opening, so that it is necessary to increase the air pressure. However, if the air pressure is increased, there is a problem that leakage from the sealed opening further progresses with the result that the eversion efficiency deteriorates and noise due to leakage of compressed air becomes remarkable.
On the other hand, also in the arrangement of Patent Document 3, the lining material can be everted without the length limitation by alternately repeating the drawing and everting of the lining material. However, in the arrangement of Patent Document 3, a mechanism for drawing the lining material of only a certain length is required, and the inlet and the outlet for the lining material must be alternately opened or closed in synchronization with the alternating operation of drawing and everting the lining material. This causes a problem that the mechanical burden and the energy loss are increased.
The present invention has been made to solve such problems and has an object to provide an everting apparatus and a method in which it is possible to reduce the eversion space for a lining material and the lining material can be continuously everted without the leakage of compressed gas that everts the lining material and without the length limitation of the lining material.
The present invention (claim 1) provides an apparatus in which a tubular lining material is airtightly attached at one end to an eversion nozzle and eversion pressure is applied to the eversion nozzle to evert the lining material, comprising:
an opening section having an opening through which the lining material can pass in contact therewith;
an eversion container having an eversion nozzle to which the one end of the lining material is airtightly attached, the container being filled with an incompressible liquid up to a predetermined level beyond the opening to form an airtightly sealed space above the liquid;
a compressed gas source that supplies compressed gas to the airtightly sealed space to evert and discharge the lining material attached to the eversion nozzle to the outside of the eversion container;
a liquid tank that stores the liquid with which the eversion container is filled; and
a liquid supply device that supplies the liquid to the eversion container in compensation for the liquid flowing out of the eversion container under the action of the compressed gas through a gap between the opening and the lining material so that the liquid in the eversion container is kept at the predetermined level.
The present invention (claim 10) provides a method for everting a lining material using an apparatus as described above, comprising:
guiding the lining material from the opening section to the eversion nozzle and airtightly attaching one end of the lining material to the eversion nozzle;
filling the eversion container with an incompressible liquid up to a predetermined level beyond the opening of the opening section to form an airtightly sealed space above the liquid;
supplying the compressed gas to the airtightly sealed space to evert and discharge the lining material attached to the eversion nozzle to the outside of the eversion container; and
In the present invention, the eversion container is filled with a predetermined level of incompressible liquid and has at the upper part thereof an airtightly sealed space for everting the lining material. Even if the compressed gas is supplied to the airtightly sealed space to evert the lining material and the liquid flows out of the eversion container under the action of the compressed gas, the liquid is supplemented to the eversion container and it is always filled with a predetermined level of liquid. Therefore, the compressed gas supplied to the airtightly sealed space can be continuously used to evert the lining material without leakage. This allows the lining material to be continuously everted regardless of the length of the lining material. Furthermore, the eversion container only needs to house the lining material from the opening into which the lining material is inserted to the eversion nozzle, so that its volume can be significantly reduced.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The present invention is used to evert a lining material for repairing an existing pipe buried underground such as an aged sewage pipe, but it is also applicable for an example in which a lining material for repairing other pipelines is everted.
Hereinafter, connecting and fixing two members in an airtight manner by fixing means of bolts and nuts is called bolting or bolt tightening. A packing member may be interposed to ensure an airtight connection. Since the two bolted members are separated by removing the bolts and nuts, it also means that the two members are detachably and airtightly connected.
On the side of the eversion container 1 opposite the side pipe 11, a side pipe 13 extends in the direction opposite the side pipe 11 and a disk 14 is bolted to the flange 13a. The disk 14 is provided with a gas supply port 15 for supplying gas supplied from a later described compressed gas source, a hot water supply port 16 for supplying hot water for curing the lining material after completion of the eversion work, and a hot water drain port 17 for draining hot water. Below the side pipe 13, a liquid supply port 18 is further attached that supplies to the eversion container 1 an incompressible liquid, which will be described later.
A disk-shaped cover 21 provided with a mount tube 20 is bolted to the flange 10a of the cylindrical portion 10 on the upper portion of the eversion container 1, and a disk 22 is bolted to the flange 20a of the mount tube 20.
The eversion container 1 is provided at the lower part with an opening section 2 having an opening into which a lining material can be inserted and through which the lining material passes in contact therewith. The opening section 2 has, for example, an opening member 30 made of MC nylon having good slippage or a metal (for example, stainless steel) polished to have good slippage. As shown in
As shown in
The lining material 60 has, when flattened, the width w2 and the height h2, as shown in
As shown in
In order to allow the lining material 60 to smoothly move through the opening 31 that horizontally extends in a slit shape, the vertical upper and lower ends of the opening 31 as viewed in the thickness direction of the passing lining material are, as shown in
The opening 31 is designed in a shape corresponding to the cross-sectional shape of the lining material so that the lining material 60 can pass therethrough and in a shape so as to come into contact with the outer surface (outer peripheral surface) of the lining material when the lining material passes therethrough. An unavoidable gap is created between the opening 31 and the lining material 60 passing there through. The eversion container 1 is, as described later, filled with an incompressible liquid, so that, when a high pressure is applied to the liquid, it flows out of the eversion container 1 through this gap or a portion that is not sufficiently in contact. In order to prevent this outflow and improve the liquid sealing property, the opening 31 is shaped so that the flow path area of the liquid that flows through the gap is made as small as possible, that is, the flow path resistance is made large. The opening member 30 thus has a function of smoothly passing the lining material and also a sealing function of preventing the liquid from leaking through the opening 31, and can also be referred to as a sealing member.
The number of opening members may be one, but an opening member 30′ having the same shape as the opening member 30 is, as shown in
Since the sealed portion 60c of the lining material 60, the connecting tool 62, and the hot water hose 63 are all smaller in thickness than h2, they can pass through the openings 31, 31′ of the opening members 30, 30′. Since the hot water hose 63 is further made of a flexible material and becomes flat, a hose having a diameter slightly larger than h2 can also be used.
The mount plate 32 of the opening section 2 is bolted to the flange 33a of a rectangular conduit 33 extending into the eversion container 1, and the lining material 60 passes through the opening members 30 and 30′ and the conduit 33 and guided into the eversion container 1.
The eversion container 1 is, as shown in
As shown in
A liquid supply device for supplying the liquid 40 into the eversion container 1, for example, a liquid supply pump 50 is disposed outside the liquid tank 41. In a case where the liquid is water, a commercially available water supply pump is used as the liquid supply pump 50. The drain port of the liquid supply pump 50 is connected to the liquid supply port 18 of the eversion container 1 through a pipe 51 and a joint 52, and the suction port thereof is connected to the liquid drain port 44 of the liquid tank 41 through a pipe 53 and a joint 54. By driving a motor 55, the liquid supply pump 50 pumps the liquid 40 in the liquid tank 41 through the liquid drain port 44 and the pipe 53 and supplies the liquid from the drain port through the pipe 51 and the liquid supply port 18 to the eversion container 1.
A compressed gas source for supplying compressed gas, for example, compressed air, compressed carbon dioxide gas, or the like is disposed in the vicinity of the liquid tank 41. In this embodiment, an example in which compressed air is used as the compressed gas will be described, so that an air compressor 56 is used as the compressed gas source. The air compressor 56 supplies compressed air to the upper part of the liquid 40 in the eversion container 1 through a pipe 57, a joint 58, and a gas supply port 15. A barometer 59 is attached to the upper part of the gas supply port 15 to measure the atmospheric pressure of the supplied compressed air. Instead of compressing the gas with a compressor, the compressed gas can be supplied from a tank, a cylinder, etc. that stores the compressed gas. Therefore, the compressed gas source can also include a tank, a cylinder, etc. that stores the compressed gas.
A liquid level gauge 45 for measuring the level of the liquid 40 in the eversion container 1 is attached to the eversion container 1.
The eversion container 1 is filled with the liquid 40 up to a predetermined level 40a beyond the openings 31, 31′. When the lining is started, compressed air is supplied to the upper part of the liquid 40 in the eversion container 1, and the air pressure due to the compressed air acts on the liquid 40 to cause the liquid 40 to flow out of the eversion container 1 to the liquid tank 41 through a gap between the opening of the opening section 2 and the lining material 60. When the liquid 40 falls below the level 40a due to this outflow, the magnetic sensor 45c detects the decrease to drive a motor 55 via a drive circuit 65 until the liquid reaches the level 40b, which is Δh higher than the level 40a. Every time the liquid falls below the level 40a, the motor 55 is driven to keep the liquid in the eversion container 1 substantially at the level 40a, allowing the eversion container 1 to be filled with the liquid 40 at the level 40a. The liquid level can also be adjusted by controlling a flow rate adjusting valve in the liquid supply pump 50. The liquid level gauge may include an electrode type liquid level gauge in which current flows between the around electrode and the detection electrode to detect the liquid level when it contacts the liquid.
Instead of thus automatically turning on and off the motor 55 of the liquid supply pump 50 according to the level of the liquid, an operator may monitor the level with the liquid level gauge 45 and drive the motor 55 for a predetermined time to maintain the liquid at the level 40a when the liquid drops below the level 40a. Alternatively, the amount of liquid outflow (leakage amount) may be estimated to adjust the flow rate adjustment valve of the liquid supply pump 50 and continuously operate it so as to compensate the outflow amount in order to maintain the liquid substantially at the level 40a.
The liquid tank 41 has a structure capable of storing the liquid 40 at a level 40c the same as or lower than the level 40a in the liquid tank 41 when the liquid 40 in the eversion container 1 is maintained at the level 40a.
Next, the operation of the thus configured apparatus for everting the lining material will be described. The eversion container 1, the liquid tank 41, the liquid supply pump 50, the air compressor 56, etc. are mounted in a state as shown in
The mount plate 32 and the cover 21 (or the disk 22) of the opening section 2 are removed, and the disk 14 and the eversion nozzle 12 are removed as necessary. As shown in
In the present invention, the lining material 60 can be continuously everted and inserted into the existing pipe without being limited to its length. Therefore, the lining material is rolled up or folded by a required length for storage in a housing container, and the housing container is mounted on a work truck. If the housing container cannot be mounted on the work truck on which the eversion container 1 or the like is mounted, it is mounted on another work truck.
Subsequently, the liquid 40 is supplied into the liquid tank 41, and the liquid supply pump 50 is driven to supply the liquid 40 to the eversion container 1 up to a level beyond the openings 31, 31′ of the opening members 30, 30′. The liquid supply into the eversion container 1 is performed by driving the liquid supply pump 50 or, in addition, removing the disk 22 to supply the liquid 40 from above into the eversion container 1. The liquid 40 becomes lower in level than the openings 31, 31′ in a short time due to an unexpected leakage thereof and the compressed air leaks from the openings 31, 31′. In order to prevent this, it is preferable to supply the liquid 40 up to a level sufficiently exceeding the openings 31 and 31′. If the liquid 40 is supplied to a very high level, the liquid 40 may flow into the eversion nozzle 12. Therefore, as shown in
Since the hot water supply port 16 and the hot water drain port 17 in the eversion container 1 are not used when everting the lining material, they are airtightly sealed with caps 16a and 17a so as not to leak air (
In this state, the air compressor 56 is driven to supply compressed air to the airtightly sealed space in the eversion container 1. As shown by the solid line arrow in
In a case in which the lining material having, for example, an outer diameter of 200 mm is everted, the lining material 60 has a width w2 of about 265 mm and a height (thickness) h2 of about 10 mm when it is, as shown in
Since a slight gap is generated between the lining material 60 and the opening of the opening section 2, the compressed air acts on the liquid 40 to cause the liquid 40 to flow out of the eversion container 1 and fall below the level 40a. Every time the liquid level falls below the level 40a, the liquid supply pump 50 is driven for a predetermined time to suck out the liquid 40 in the liquid tank 41 and supplement it to the eversion container 1, as shown by the dotted arrow. This allows the liquid in the eversion container 1 to be maintained substantially at the level 40a. Therefore, the compressed air can be continuously used for everting the lining material, and the lining material can be continuously everted without limitation of the length thereof. Furthermore, only the liquid 40 leaks from the opening, allowing the noise caused by the fluid leakage at the time of eversion to be remarkably reduced. The lubricity of the liquid or the curved portions 32a, 32a′ of the openings 31, 31′ further allows the frictional resistance to be reduced when the lining material 60 passes through the openings 31, 31′. The lining material 60 receives buoyancy in the liquid tank 41, making smooth transfer possible without being bent by gravity.
The eversion efficiency of the lining material 60 depends on the smoothness of the lining material 60 as it passes through the opening of the opening section 2 and the sealing function of preventing the liquid 40 from flowing out of the gap between the lining material 60 and the opening. The smoothness of the opening section 2 and the sealing function conflict with each other. If the opening is, for example, enlarged for improvement in smoothness, the smoothness increases, but the gap also increases and the sealing function reduces. On the other hand, if the opening is made smaller, the sealing function improves but the smoothness disappears.
In this embodiment, MC nylon having good slippage or a metal polished to have good slipperiness (for example, stainless steel) is used as a material for the opening members 30 and 30′ for improvement in smoothness. The openings 31 and 31′ are further provided with the curved portions 30a and 30a′ to reduce the frictional resistance of the lining material 60 when passing through the openings.
On the other hand, not only the opening member 30 but also the opening member 30′ is provided to double and enhance the sealing function. A thickener such as CMC (carboxymethyl cellulose) or xanthan gum may be added to the liquid 40 to increase the viscous resistance when the liquid passes through the gap. If the sealing function is doubled, the smooth less disappears. Therefore, only the opening member 30 is used in a case where the smoothness is important.
When the sealed portion 60c of the lining material 60 passes through the openings 31, 31′ and the following hot water hose 63 passes therethrough, liquid leakage increases. For this, the liquid supply pump 50 is powered up to increases the supply amount from the liquid supply pump 50 in order to maintain the liquid level. If the liquid level cannot be maintained even if the liquid supply pump 50 is powered up, an opening section having an opening suitable for the passage of the hot water hose may be provided, as will be described later.
The higher the air pressure of the compressed air, the higher the eversion speed, which is preferable for everting the lining material 60. However, the larger the degree of compression, the larger the amount of the liquid 40 leaking from the gaps of the openings 31 and 31′. Therefore, the liquid level is measured by the liquid level gauge 45, and for a large amount of leakage, the amount of supply by the liquid supply pump 50 is increased to maintain the liquid level. If the liquid level cannot be maintained due to insufficient power of the liquid supply pump 50, the degree of compression of the air compressor 56 is adjusted.
The eversion operation is finished when the lining material 60 is everted over the entire length and inserted into the existing pipe to be lined over the entire area thereof and the tip of the hot water hose 63 connected to the end of the lining material 60 protrudes from the tip of the existing pipe.
Once the eversion work has been completed, the liquid 40 in the eversion container 1 is drained and the opening section 2 is airtightly closed by a cover (not shown). The end of the hot water hose 63 is guided to the hot water supply port 16 and hot water is supplied from a hot water source into the hot water hose 63. At this time, an appropriate amount of compressed air is supplied from the air compressor 56 into the eversion container 1 to expand the everted lining material 60 and press it against the inner wall surface of the existing pipe. The hot water is ejected from the hot water hose 63 onto the lining material 60 to cure the lining material 60, thus completing the lining work.
In a case where the hot water hose is not connected to the lining material and the lining material is cured without using the hot water hose, the hot water is directly supplied into the eversion container 1 from the hot water supply port 16 and the inside of the everted lining material 60 is fully filled with the hot water to cure the lining material.
The sealed portion 60c, the connecting tool 62, and the hot water hose 63 of the lining material 60 described above are all shaped so as to be able to pass through the openings 31, 31′ of the opening members 30, 30′. However, there are lining materials having a thickness (height) at which the sealed portions 60c and/or the connecting tool 62 cannot pass through the openings 31, 31′. For a water hose small in diameter, a large amount of liquid leaks from the openings 31 and 31′ when the hot water hose passes therethrough, and the power of the liquid supply pump 50 may not be able to compensate for the leak.
The eversion container 70 has at its lower portion a first opening section 71 provided with a variable opening through which a lining material passes and a second opening section 81 provided with a variable opening through which a hot water hose connected to the end of the lining material passes.
a and 14b show the detailed configuration of the first opening section 71. The first opening section 71 has an opening member 72 made of the same material and having the same shape as the opening member 30 of the opening section 2. While the opening member 30 is an integral member, the opening member 72 is vertically symmetrically divided into two halves 72a and 72b as shown in
The opening member 72 may be one, but, as shown in
The first opening section 71 is disposed in a conduit 91 following a conduit 90 connected to the eversion container 70 with a nut 76 and a bolt 77 disposed on the upper portion thereof (
The lower half 74b of the mount plate 74 is fixed to a bottom 95a of a connecting pipe 95 inserted into the conduit 91, or is seated on the bottom of the conduit 91 by its own weight and held by a guide plate, so that, when the handle 93 is rotated to raise the nut 76, the upper portion of the first opening section 71 ascends from the position shown in
a and 17b show the detailed configuration of the second opening section 81. Like the first opening section 71, the second opening section 81 has an opening member 82 that is vertically symmetrically divided into two halves 82a and 82b and provided with a horizontally extending slit-shaped opening 83 having a width w3 and a height The opening 83 is sized to come into contact with the hot water hose 63 and pass it therethrough. The opening member 82 may be one, but, as shown in
The second opening section 81 is disposed in a conduit 96 following the connecting pipe 95, and a nut 86 fixed to the half 84a of the mount plate 84 and a bolt 87 are disposed on the upper portion of the second opening section 81 (
The lower half 84b of the mount plate 84 is fixed to a bottom 97a of a conduit 97 inserted into the conduit 96, or is seated on the bottom of the conduit 96 by its own weight and held by a guide plate, so that, when the handle 93 is rotated to raise the nut 86, the upper portion of the second opening section 81 ascends from the position shown in
On the other hand, the connecting tool 68 cannot pass through the opening 73. Therefore, by the time the connecting tool 68 reaches the position shown in the upper part of
As shown in the lower part of
The two opening sections are thus provided and the openings thereof are made variable. This allows the lining material to be reliably everted even in a case where the diameter of the lining material or the end portion (sealed portion and/or connecting tool) of the lining material is different in size.
In Embodiment 1 described above, the lining material can be everted and inserted into the existing pipe without limiting the length of the lining material. However, in a case in which the total length of the lining material to be inserted into the existing pipe becomes long, the frictional resistance of the lining material with the existing pipe increases and the amount of air required for eversion increases. This makes the eversion difficult due to insufficient capacity with a small air compressor. On the other hand, the eversion is likely to be out of control if a large air compressor is used as a countermeasure.
In Embodiment 2, in addition to the eversion pressure due to compressed air, the circulating liquid 40 in the liquid tank 41 is injected into the lining material 60 in an attempt to also utilize the eversion pressure due to the hydraulic pressure of the liquid 40 to evert the lining material.
As shown in
Since the hydraulic eversion is slower than the pneumatic eversion, the latter is used at first. The lining material 60 is guided to the eversion nozzle 12 and attached at one end to the eversion nozzle 12. After that, the liquid supply pump 50 is driven with the flow rate adjusting valve 50a fully opened to supply the liquid 40 into the liquid tank 41 so that the liquid level in the eversion container 1 is lower than the level of the eversion nozzle 12. In this state, the flow rate adjusting valve 56a is fully opened to drive the air compressor 56. Since the compressed air acts as an eversion pressure on the lining material 60 attached to the eversion nozzle 12, the lining material 60 is inserted into the existing pipe 67 through the manhole 66 and the bent pipe 69.
After the lining material 60 is inserted due to the air pressure for a predetermined length, for example, several meters from the inlet of the existing pipe 67, the flow rate adjusting valve 56a is temporarily closed to interrupt the pneumatic eversion. While fully opening the flow rate adjusting valve 50a, the liquid 40 is, as shown in
The eversion speed of the lining material 60 due to air pressure can be controlled by adjusting the amount of air supply with the flow rate adjusting valve 56a. When the amount of water supplied into the lining material 60 increases and the liquid level in the lining material rises, the flow rate adjusting valve 50a reduces the amount of water supplied in a case where the eversion speed increases and the liquid level in the lining material pipe decreases, the flow rate adjusting valve 50a increases the amount of water supplied.
By adjusting the opening degree of the flow rate adjusting valve 56a to adjust the eversion speed due to the air pressure and adjusting the opening degree of the flow rate adjusting valve 50a to adjust the amount of liquid supplied into the lining material 60, the pneumatic eversion and the hydraulic eversion are performed so that the liquid level 40e in the lining material 60 is, as shown in
As is clear from
Once the lining material 60 has been everted over the entire length thereof and inserted over the entire area of the existing pipe to be lined, the eversion operation is stopped. The lining material 60 is already filled with the liquid 40, so that the liquid 40 is guided to a work truck (not shown) equipped with a boiler, and it is heated and circulated by the boiler to heat and cure the lining material 60. In this way, the heat curing work can be started at the same time as the eversion is completed. Therefore, it is advantageous that the time is shortened and there is no need to attach the heat curing hot water hose 63 as shown in
In Embodiments 1 and 2 described above, the eversion containers 1 and 70 are disposed upright in the liquid tank 41.
As shown in
The eversion nozzle 112 is removed from the cylindrical portion 111, and the lining material 60 is guided into the liquid tank 41 through guide rollers 114 and 115 and passed through the openings 31, 31′ of the opening members 30 and 30′. Subsequently, one end 60d of the lining material 60 is folded back and airtightly attached to the eversion nozzle 112 using the band 61. The eversion nozzle 112 is then bolted to the cylindrical portion 111.
Next, the liquid 40 is supplied to the liquid tank 41, and the liquid supply pump 50 is driven to supply the liquid 40 to the eversion container 110 until the liquid in the eversion container 110 reaches a predetermined level 40a exceeding the openings 31 and 31′.
Subsequently, the air compressor 56 is driven to supply compressed air to the airtightly sealed space above the liquid 40 in order to evert the lining material 60 for insertion into the existing pipe through the manhole.
When the compressed gas acts on the liquid 40 to cause the liquid 40 to flow out through a gap between the openings 31, 31′ and the lining material 60 and the liquid level to drop below the level 40a, the liquid supply pump 50 is driven to maintain the liquid level in the eversion container at the level 40a. In a case where the liquid level gauge 45 does not detect a level drop, the power of the liquid supply pump 50 is adjusted so that the outflow amount is returned to the eversion container 110. If the compression pressure is too high, the outflow amount of the liquid 40 also increases, so that the barometer 59 monitors the compression pressure to adjust the power of the air compressor 56.
When the hot water hose connected to the lining material 60 is inserted into the existing pipe, the eversion operation is completed. The eversion container 110 is filled with the liquid of the predetermined level 40a. Therefore, the compressed air can be used to continuously evert the lining material without leaking from the openings 31, 31′ of the opening 113, and the lining material can continue to be everted without limitation of the lining material length. In such a configuration, the lining material 60 is guided to the eversion nozzle 112 substantially linearly without contact without using a guide roller the eversion container 110, so that the lining material 60 moves smoothly.
For eversion of a lining material having a different diameter, an opening section is used that has a different opening depending on the diameter of the lining material. Specifically, the mount plate 32 or the disk 114 is removed together with the opening members 30 and 30′, and a mount pirate or a disk is used that mounts an opening member having an opening through which the lining material of the different diameter can pass.
In each of the above-described embodiments, the opening of the opening section is a slit-shaped opening having dimensions corresponding to the width and thickness of the flattened lining material, but the opening may be such that it allows the lining material to be inserted and passed therethrough with a small gap through which tine lining material passes, and the opening may be shaped so as to correspond to the cross-sectional shape of the passing lining material. For example, when the lining material is partially thickened and folded, an opening member is used that has an opening corresponding to the folded cross-sectional shape.
In each of the above-described embodiments, the eversion container is disposed inside the liquid tank, but it may be disposed outside the liquid tank. At this time, the liquid leaking from the opening is collected separately using a collection container. In this case, the liquid tank 41 stores a liquid exceeding the amount of liquid expected to leak from the opening by the time the eversion operation is completed, or the collected liquid may be returned to the eversion container by the liquid supply pump.
1 eversion container
2 opening section
10 cylindrical portion
12 eversion nozzle
15 gas supply port
16 hot water supply port
17 hot water drain port
18 liquid supply port
30, 30′ opening member
31, 31′ opening
40 liquid
41 liquid tank
44 liquid drain port
45 liquid level gauge
50 liquid supply pump
56 air compressor
59 barometer
60 lining material
63 hot water hose
66 manhole
67 existing pipe
68 connecting tool
70 eversion container
71 first opening
72, 72′ opening member
73, 73′ opening
74 mount plate
75 openings
81 second opening
82, 82′ opening member
83, 83′ opening
84 mount plate
85 opening
110 eversion container
112 eversion nozzle
113 opening
Number | Date | Country | Kind |
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2018-227589 | Dec 2018 | JP | national |
Filing Document | Filing Date | Country | Kind |
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PCT/JP2019/044189 | 11/11/2019 | WO | 00 |